Batch Edit Memos

[mdg-pnw]

This is achievable via API, but it'd be great if there were a GUI option for editing multiple memos at one time.

I could see this being implemented in two ways.

1. Manual Selection: Add a checkbox in the of each memo that appears when hovering over the appropriate area. If any memo is checked, make the checkbox visible on every memo and show a modal window for actions to apply to all selected. Include an option to Select None in the modal window to revert to hidden checkboxes.
2. Search Based Selection: If a search filter is in place, then add options for batch editing to the menu.

Batch edits could include:

1. Add/remove tags
2. Delete/Archive Memo
3. Move memo (Private/Workspace/Public)
4. Pin/unpin